"A 30-year-old captain and 26-year-old first lieutenant died in the accident."

Middendorp said Dutch investigators were probing the crash.

The captain died on impact, while the first lieutenant died of his wounds shortly afterwards at a French military field hospital in Gao, Middendorp added.

Both men were members of 301 Squadron based in Gilze-Rijen airbase in southern Netherlands.

MINUSMA has some 11,000 personnel on the ground in Mali, around 670 of whom come from the Netherlands.

With more than 40 peacekeepers killed since its inception in 2013, MINUSMA is considered the most dangerous UN mission in the world, particularly for the Chadian contingent, which has sustained a large proportion of the casualties.

In a statement, the UN Security Council called it a "tragic accident" and sent condolences to the families of the dead and the Dutch government.